Buggy code:
private Vector links = new Vector ( 2 ) ; private Vector groups = new Vector ( 2 ) ; private String charset = null ; public void setMaxmemory ( String src ) { } public void setadditionalParam ( String src ) { } public void setSourcepath ( Path src ) { } public Path createSourcepath ( ) { } public void setDestdir ( String src ) { } public void setSourcefiles ( String src ) { } public void setPackagenames ( String src ) { } public void setOverview ( String src ) { } public void setPublic ( String src ) { } public void setProtected ( String src ) { } public void setPackage ( String src ) { } public void setPrivate ( String src ) { } public void setDoclet ( String src ) { } public void setDocletPath ( Path src ) { } public Javadoc . DocletInfo createDoclet ( ) { } public void setOld ( String src ) { } public void setClasspath ( Path src ) { } public Path createClasspath ( ) { } public void setBootclasspath ( Path src ) { } public Path createBootclasspath ( ) { } public void setExtdirs ( String src ) { } public void setVerbose ( String src ) { } public void setLocale ( String src ) { } public void setEncoding ( String src ) { } public void setVersion ( String src ) { } public void setUse ( String src ) { } public void setAuthor ( String src ) { } public void setSplitindex ( String src ) { } public void setWindowtitle ( String src ) { } public void setDoctitle ( String src ) { } public void setHeader ( String src ) { } public void setFooter ( String src ) { } public void setBottom ( String src ) { } public void setLinkoffline ( String src ) { } public void setGroup ( String src ) { } public void setLink ( String src ) { } public void setNodeprecated ( String src ) { } public void setNodeprecatedlist ( String src ) { } public void setNotree ( String src ) { } public void setNoindex ( String src ) { } public void setNohelp ( String src ) { } public void setNonavbar ( String src ) { } public void setSerialwarn ( String src ) { } public void setStylesheetfile ( String src ) { } public void setDocencoding ( String src ) { } public void setPackageList ( String src ) { } public Javadoc . LinkArgument createLink ( ) { } public class LinkArgument { private String href ; private boolean offline = false ; private String packagelistLoc ; public LinkArgument ( ) { } public void setHref ( String hr ) { } public String getHref ( ) { } public void setPackagelistLoc ( String src ) { } public String getPackagelistLoc ( ) { } public void setOffline ( String offline ) { } public boolean isLinkOffline ( ) { } } public Javadoc . GroupArgument createGroup ( ) { } public class GroupArgument { private String title ; private String packages ; public GroupArgument ( ) { } public void setTitle ( String src ) { } public String getTitle ( ) { } public void setPackages ( String src ) { } public String getPackages ( ) { } } public void setCharset ( String src ) { } public void execute ( ) throws BuildException { <START_BUG> if ( ( ( sourcePath ) == null ) && ( ( destDir ) == null ) ) { <END_BUG> String msg = "sourcePath<seq2seq4repair_space>and<seq2seq4repair_space>destDir<seq2seq4repair_space>attributes<seq2seq4repair_space>must<seq2seq4repair_space>be<seq2seq4repair_space>set!" ; throw new BuildException ( msg ) ; } boolean javadoc1 = ( Project . getJavaVersion ( ) ) == ( Project . JAVA_1_1 ) ; log ( "Generating<seq2seq4repair_space>Javadoc" , MSG_INFO ) ; Vector argList = new Vector ( ) ; if ( ( classpath ) == null ) classpath = Path . systemClasspath ; if ( ( maxmemory ) != null ) { if ( javadoc1 ) { argList . addElement ( ( "-J-mx" + ( maxmemory ) ) ) ; } else { argList . addElement ( ( "-J-Xmx" + ( maxmemory ) ) ) ; } } if ( ( ! javadoc1 ) || ( ( sourcePath ) == null ) ) { argList . addElement ( "-classpath" ) ; argList . addElement ( classpath . toString ( ) ) ; if ( ( sourcePath ) != null ) { argList . addElement ( "-sourcepath" ) ; argList . addElement ( sourcePath . toString ( ) ) ; } } else { argList . addElement ( "-classpath" ) ; argList . addElement ( ( ( ( sourcePath . toString ( ) ) + ( System . getProperty ( "path.separator" ) ) ) + ( classpath . toString ( ) ) ) ) ; } if ( ( destDir ) != null ) { argList . addElement ( "-d" ) ; argList . addElement ( destDir . getAbsolutePath ( ) ) ; } if ( ( version ) && ( ( doclet ) == null ) ) argList . addElement ( "-version" ) ; if ( nodeprecated ) argList . addElement ( "-nodeprecated" ) ; if ( ( author ) && ( ( doclet ) == null ) ) argList . addElement ( "-author" ) ; if ( noindex ) argList . addElement ( "-noindex" ) ; if ( notree ) argList . addElement ( "-notree" ) ; if ( pub ) argList . addElement ( "-public" ) ; if ( prot ) argList . addElement ( "-protected" ) ; if ( pack ) argList . addElement ( "-package" ) ; if ( priv ) argList . addElement ( "-private" ) ; if ( ( encoding ) != null ) { argList . addElement ( "-encoding" ) ; argList . addElement ( encoding ) ; }

Fix:
if ( ( ( sourcePath ) == null ) || ( ( destDir ) == null ) ) {